Stop mechanism for sewing machines



July 17, 1928. 1,677,673

I R. A. GRAMQE STOP MECHANISM FOR SEWING MACHINES Original med Aug. 11.1924 2 Sheds- Sheet 1 INVENTOR. 12/1 'mmw,

A. ATTORNEYS Julyl7, 192s. 1,677,673

R. A. GRAMSE s'roP MEGHANISKFOR snwme MACHINES Original Filed Aug.11.1924 2 Sheets-Sheet 2 I N VEN TOR. 1Z1 mzrmq,

J6 ATTORNEYS Patented July 17, 1928.

u i-TEnsrATEs PATENTJQFFICE.

may a GRAMSE, or rannoan,

,- .CHINERYQQ,

Gonti nuationyot application eria1 No.

' Myinvention relates to improvements 1nv stop mechanism for sewingmachines. the present embodiment of the invention be ng particularlydesigned and adaptedfor' use in connection with that class or'type ofsewing machines commonly known as dial A further and very importantobject is the provision of an improved stop motion at tachment which maybereadilyattarihedto or detached from the ordinary or conventional formof dial looper without inany way interfering with the normal operationof the latter, including in particular improved'clutch shifter mechanismcont-rolled by the thread for shifting the clutch shift mechanism to anopen or stopped position.

A further object of the inventioiris to provide a control for the clutchshiftcrmechanism which will be normally maintained in inoperativeposition but which will be rendered operative to shift the clutchshifter mechanism to an open orstopped'pos'ition either upon breakage ordepletion of the thread or upon the occurrence of a knot in the thread.1

1 A still further and important object is the provision of an improvedknot catcher arranged in co-operative relation to the thread tension andsewing mechanism, said knot catcher being provided withan improved formand arrangement of thread intercepting and deflecting means adapted uponthe occurrence of a knot to intercept and move the thread to one side,thereby releasing the thread control'or trip mechanism to positivelymove the stop mechanism to release the inachinedriving parts.- 9 v vWith the above mentioned and other ends in view, theinvention consistsin the novel KENTUCKY, nssieiioa'ro sonrnn m TEXTILE MA- on rAnUoAn,KENTUCKY, A CORPORATION or KENTUCKY.

scuorf MECHANISM r03 s'EwIiIG MACHINES.

781,295, fi1ed August 11, 1924. This-application flledJ'une 20,. 1927.Serial No. 199,967.

construction, arrangement and combination of parts, herelna-ft'erdescribed, illustrated in one of its embodiments in 'the accompany ingdrawings, and particularly pointed out in the appended cla ms. i

Referring to the j drawings, forming a part .of thisspecification,

Figure 1 is a top planview of a sewing machine of the dial looper type,equipped with stop mech'anismconstructed in accord ance wit-h'thisinvention, the old or conventional machine part-s beingshownin dottedlines, I

. Fig. 2, a top plan view of th'e thread and cam controlled shiftablelink adapted in one postion to clear the driving and clutch shifte ingmechanism and in another to connect therewith and shift the clutchshifting mech I anism to an-op'en position.

Fig. 3, an end elevation of said thread and cam controlled shifter link,detached, as in Fig. 2.

Fig. 4,]a top plan view of a dial looper I equipped with the improvedstop mechanlsm and showing the parts in their connected fully shiftedclutch released position, "as upon the occurrence of a knotted or brokenthread. i

I Fig. 5, an enlarged side elevation of the improved oscillatory knotcatcher andthread guide and shift mechanism in association with theconventionalthreadcatcher mechanism, and in normal sewing or. untripped.

position. 1

Fig. 6, a front elevation of thesame.

Similar numerals of reference designate drawings.

Y In Figs. land dot the drawings, I have shown my improvements appliedto a sewing machine of the dial looper type embodying the usual bedplate 1, together with the usual overhanging dial supporting arm' likeparts throughout all the figures of the relatively circnmferentiallyfixed and movable clutch members 4; and 5, respectively on the end ofthe driving shaft 3, the longitudinally movable circumferentially fixedclutch 1 being adapted to be moved or shifted by means of a slide orshift member 4, operating in a sleeve or guard member 6, and provided.with spaced bearing members 1 adaptedto be positively 'moved to and fromthe respective engaged and disengaged positions by means of aninterposed cam 7, horizontally movable on a suitable bearing, the cam 7being provided with an actuating arm or lever 7 The clutch shiftermechanism includes a longitudinally movable clutch shifter 8,consisting, in the present instance, of a shifter rod extendingforwardly and parallel with the overhanging arm 2 and supported in asuitable guide bracket 9.

As a means of positively actuating the clutch shifter mechanism, whenthe stop mechanism hereinafter referred to is brought into action, thedriving shaft 3 is provided at one side with a drive -wheel 10 which, inthe present instance, is in the specific form of a rotary channel shapedmemher having a driving'pin or projection 10.

The clutch shifter member or rod 8 is also provided with a sleeve orprojection 8, having a stud member 8 to be engaged by the threadcontrolled link of the stop mechanism when said link is engaged by theabutment or projection 10, as hereinafter referred to.

As a means of providing a link device adapted in one position to clearthe said driving and clutch mechanism and in another to connecttherewith and shift said clutch mechanism to open the clutch and stopthe drivingmechanism and the various devices connected therewith, alongitudinally and transversely movable link 11, is provided, the bodyof said link, in the present instance, being in the specific form of arod or shaft 11 carried in suitable bearings 12, of a supporting andattaching plate 12. The plate 12, in the present instance, is attachedto the top of the overhanging arm 2 by means of attaching elements orscrews 12 The rod or link 11 is loosely mounted in the bearings 12 sothat it may be readily moved longitudinally, as well as rocked or tiltedthrough the control arms or levers nowdescribed. The relatively movableor pivotable link 11 is provided at one end with a depending arm orlever 11 (seeFig. 3) and at the other end with a horizontally extendingarm or lever 11", the latter extending above the clutch shifter 8 and insuitable proximity to the sleeve 8 and projection 8 to engage the latterwhen tilted by the thread controlled trip mechanism, hereinafterreferred to.

As a means of holding the link 11 with its arms 11 and 11 in a neutralposition mechanism is provided consisting, in the presentinstance, of acam member 13, pivotally mounted at one side of the attaching plate andarranged to engage beneath the arm 11 and in the normal position adaptedto sustain the arm 11 with the arm 11 in a neutral position (see Fig. 1)and in another position to be engaged by the projection 10 and to engageand shift the.clutch shifter 8, as shown in Fig. 4 of the drawings. Thecam 13 may be of any suitable form and, in the present instance, isformed as an off-set portion of a. shaft *1331mounted in bearings 12, ofthe plate 12, said cam or shaft being provided with a'horizontallyextending arm 13", having its free. end normally sustained by the thread14, after passing through the tension device or disc'15,;arranged on thedisc stud 16. The thread tension device may be of the usualconstruction, as shown, and mounted on the usual tension post orpedestal 17. passing through the tension, disc 15 and through an openingor eye 18*- of a post or stud 18 is led from the tension disc 15 over athread guide 19, after which it is passed down to the sewing mechanismand by being so arranged a horizontally extending taut portion 14* ismaintainedbetween the thread tension and thread guide mechanism forconveniently supporting the thread controlled arm 13;

As a means of causing the trip arm 13 to drop and thereby bring the stopmechanism into use when a knot or enlarged or obstructing portion occursin the. thread, a thread controlled knot catcher and trip device isprovided, said. device, in the present instance, comprising anoscillatory member 20, carried in a pivoted block 21, loosely mounted onthe stud shaft 16, the member 20 being provided at one end with a knotcatcher consisting, in the present instance, of a loop head 20 having avertical slot 20 to readily receive the thread 14 As a means of engagingand deflecting the taut thread portion l4: away from vthe threadsustained triparm 13 in the eventthat, a knot comes into engagement withthe knot catcher and as the latter swings downwardly, the threadcontrolled or actuated member 20 is provided at one end'and near the arm13 with an arm or upwardly and outwardly inclined thread interceptingand moving clement 20, which upon moving upwardly will deflect thethread, thus clearing the end of the trip arm 13 and allowingthelatterto drop. Should a break in the-thread occur, the loosencss in the threadin proximity to the trip arm 13 will obviously allow the latter to dropand function,-as above described, likewise upon depletion of the Thethread 14: after thread the trip arm -13 *Will permitted to drop andthus render thestop mechanism operative. T e

iis is a continuation of application Serial No; 731,295, filed August11, 1924.

I claim 1. In combination with" the drive and drive control mechanism ofa sewing machine, of stop motion mechanism including a thread controlknot catcher and trip de-' vice, said trip device being operable by saidknot catcher and upon 'depletion of the threadg said trip device beingnormally supported by thethread and movable to operative positionlay-gravity.

2. In combination with drive control mechanism of a sewing machine, of astop motion mechanism includlng a normally inoperative trip device, saidtrip device being rendered operable by the presence of a knot inthe-thread and upon breakage" or depletion of said threadsaid tripdevice being normally supported the thread and movable to operativeposition by ravity.

said shaft, and a stop motion mechanism for rendering said clutchinoperative, said stop motion comprising a shifter mechanism connectedto "said clntch, a driving mechanism operable by said shaft, andthreadei'igaging means'operable by disen-v gageinent of the thread therefromfor connecting said driving and clutch shifter mechanisms, and means fordeflecting the thread and moving it ontof engagement with the lastmentioned means.

In a sewing machine, the combination of a driving shaft, a clutchmechanism on saiashaft, and a stop-rnotion mechanism for rendering saidclutch inoperative, said stop mot-ion comprising a shifter" mechanismconne'cted to sa d clii-tch, a driving mechanism connected from theshifter mechanismfa' connecting member for connecting said driv ing andclutch thread engaging; trip, said connecting mem ber beingnormallymaintained in position bysaid trip to render the clutch "shifter in--operable, said trip being rendered operable drive control mechanism 'of'of stop motion mechanism including the drive and p v a sewing machine,the combination of a driving shaft,'a' clutch mechanism-on shiftermechanisms, and a y therefrom, whereby said connecting member may beactuated to render the 'stopmech: anism operative,

6. In combination chine, a thread controlled knot catcher and tripdevice, said trip device having an? element supported in inoperativeposltion by the thread. a k a v j 7 In a looping machine, includingdriving vand driving shifter mechanism, driving shifter meanscontrolling rendering saidmeansoperable during an u nil-lte'i' ruptedfeed of threadto the machine, said'trip bei controlled by the positionof the thread re atively to 'an'element thereof to support the; latterin neutral or inoperative position, "and means for moving the threadrelativelyto the tripelement upon 00 currence of a'knot in said thread.7

8. In combination with the drive and drive control mechanism, of alooping machine, including thread tension mechz'ainisirrv of stop motionmechanism 1ncludtherefor, in a thread control device for controllingsaid drive control -m'echa'nism, said thread control device embodying anelement nordeflection ofthe thread told'isengageit- 'and means fordeflecting. the thread from'said trip upon-occurrence of akn'otin thethread. a

with the drive and!- a sewing ma said driving" shifter mech'an1sm,'and atrip mechanism for mally supported in neutral position-by the 1 thread,and means -engage'able by a knotin' the thread for deflecting the saidthreadand' moving it f-rom'the position in which it nor lnally supports:said element. v

9; In a looping machineincluding driving and clutch shifter and threadtension mechanisms, connections between said. driv:- ing and clutchshifter mechanisms, and "a trip normally operative o'sition byengagement with-the thread" an adapted to render said connectionsoperable upon-depletion or breakageof the thread as well as uponmovement of the thread relatively thereto.

10. -In a device of the character described,

in combination Jwith the thread tension mechanism of a sewing-machineand the driving mechanism therefor, :a trip mechanism having an element"normally suported-in inoperative position the thread,

and amo'vable knot catcher having an arm: adaptedgto intercept and movethe thread to 'one side of said trip element when aknot occurstherein,'-whereby said trip will 'be renderedo erable. Y

11. In combination with a sewing machine including driving and clutchshifter mechanism, a link, loo'sely and lpivoj'tally mounted betweensaid driving and clutch shifter mechanism, a taut threadsustainedmaintaining said connections inoperatlve, said trip being controlled bythe tension oflthe threadand maintained in in and controlled device bywhich said link is held in a neutral position, said thread sustained andcontrolled device being movable upon breakage or deflection of the tautthread to permitsaid link to move into engagement with said driving. andclutch shifter mechanisms to thereby disconnect the driving mechanism,and means operable by a knot in the thread for likewise permitting amovement of the thread sustained and controlled device whereby said linkwill also be permitted to move into engagement with said driving andclutch shifter mechanism,

12. In a machine of the character described, in combination with thedriving and thread tension and clutch shifter mechanisms of a sewingmachine, a link interposed between said driving and clutch shiftermechanisms, means sustained by the thread for holding said link in aneutral position, said link being free to move to its operative positioninto engagement with said driving and clutch shifter mechanisms upondepletion or breakage of the thread, and means operable by a knot in thethread to deflect or movesaid thread with respect to thethread sustainedmeans and render said link free to move to its operative position. i I

13. In a stop motion device for'sewing machines, in combination with thedriving and clutch shifter mechanisms thereof, a

link normally positioned to clear said driving and clutch shiftermechanisms, said link being movable to connect with said driving andclutch shifter mechanisms, a trip by which said link is maintained inits neutral position, said trip being normally sustained by the threadwhereby said trip will be operated and the link moved from its neutralposition upon breakage or depletion of the thread, and a knot catcherhaving a thread intercepting and deflecting element adapted uponoccurrence of a knot in the thread to deflect said thread from itsnormal trip sustaining position and thereby permit movement of the linkfrom its neutral position.

14. In a structure of the character described, a driving shaft providedwith a clutch member, a clutch shifter, a wheel on said shaft foractuating said clutch shifter, a pivoted link having arms normallypositioned to clear said wheel and clutch shifter,

said link andthe arms thereof being movable to be engaged by said wheeland clutch shifter to actuate the latter, means for maintaining saidlink in its neutral position from a taut thread leading to the sewingmachine, and a pivoted thread guide including a knot catcher adaptedto'be actuated by a thread knot to shift said means for maintaining thelink in its neutral position and permitting said link to move from itsneutral position to an operable or clutch shifter position,

thereby effecting a stoppage of the driving adapted to move thesame andpermit said thread supported member to release said link and allow thelatter to assume a position to engage said projection and clutchshifter. t

16. In a device of the character described,

a driving shaft having a projection, clutch driving mechanism on saidshaft, a thread tensioning mechanism including a movable knot catcherand thread deflector,"a clutch shifter, a link movable into and out ofengagement with said projection and clutch shifter, a link supportingmember and a triparm connected to said link supporting member andnormally supported on the tension thread for maintaining said member andthe link in position to prevent engagement of the link with theprojection and clutch shifter, whereby deflection of the thread by theknot catcher and thread deflector or breakage or depletion of saidthread will result in the removal of the supporting thread for the triparm and permit the link supporting member and link to assume positionswhereby the link will engage the projection and clutchshifter.

17 In a device of the, character described,

in combination with the driving shaft of a sewing machine includingaclutch driv- 1ng mechanism, and a thread tension device, an oscillatorythread guide and knot.

catcher, means for shifting said mechanism, a thread supportedtrip-member associated with said thread tension device and thread guideand knot catcher, and means for engaging and rendering said clutchshifter operable, said means being held in neutral position by saidthread supported trip member, and said means being movable intoconnected relation withsaid driving shaft and said clutch shifter tothrow the driving shaft and its connections out of, operation-uponmovement of the thread, supported tripmember, said trip members beingfree to move upon breakage or depletion of the thread or uponoscillation of said thread guide and knot-catcher. v

18. In a device of the character described, a driving shaft having aprojection, clutch driving mechanism onv said shaft, thread tensionmechanism including an oscillatory,

thread guide and knot catcher adapted to deflect the thread uponoccurrence of a knot therein, a clutch shifter, a cam member havv ing anarm normally supported on the thread carried by said thread guide andtension mechanism, and a pivoted movable link interposed between saiddriving shaft, projection and clutch shifter, said link being held bysaid cam member in neutral position when said. member is in its normally10 thread supported position and said link being movable to connect saidprojection and clutch shifter when said thread supported cam member isfreed by breakage or depletion of the thread by said knot catcher.

ROY A. GBAMSE.

the thread or by deflection of 1

